Where to stay in Paris - 1 night to see sights before Disney

I’d like to stay for a day and night in Paris before going onto 4 days in Disney (already booked) but don’t know which area would be best to look for accommodation. I’ll be travelling with my sister and my 3 and 5 year old, so we don’t want to do too much walking. We’d like to see the Eiffel Tower and if possible he moulin rouge. I’m not sure what else would be interesting to the children (5 year old is very mature and would be appreciative of more than you’d think for his age - 3 year old will mostly be on my back in a sling), so am open I any suggestions.